91942390 has 16 divisors (see below), whose sum is σ = 166595040. Its totient is φ = 36532800.

The previous prime is 91942381. The next prime is 91942391. The reversal of 91942390 is 9324919.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91942391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28935 + ... + 31954.

It is an arithmetic number, because the mean of its divisors is an integer number (10412190).

Almost surely, 2^91942390 is an apocalyptic number.

91942390 is a deficient number, since it is larger than the sum of its proper divisors (74652650).

91942390 is a wasteful number, since it uses less digits than its factorization.

91942390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61047.

The product of its (nonzero) digits is 17496, while the sum is 37.

The square root of 91942390 is about 9588.6594474932. The cubic root of 91942390 is about 451.3414948387.

The spelling of 91942390 in words is "ninety-one million, nine hundred forty-two thousand, three hundred ninety".